# A "bump" in the cooling curve of naphthalene? [closed]

While doing an experiment, I noticed a slight bump in the cooling curve. I have searched for it on the internet and all of the articles say that it is something related to super-cooling.

The graph's bump is shown below:

X Axis is time, Y Axis is the temperature.

What is the specific reason for this?

• Since there is absolutely no detail in the graph, I'm going to assume that the x-axis is measured in elephants and the y-axis in mouses. In which case, I would have to say that I'm not sure how mouses and elephants have to do with supercooling or cooling in any way. Sep 19 '15 at 11:27
• Hahahaha! After reading that comment, I was smirking in my class; I am so sorry for not mentioning that, I thought I had it on the image, but since I didn't see the preview, that happened. Sep 19 '15 at 13:10
• @weirdpanda: Laugh all you want but without an accurate description of the experiment no one here will be able to throw some light on your bump. Personally I do have an idea what it might be but I won't make a fool of myself by speculating on such little information.
– Gert
Sep 19 '15 at 13:47

What happens is that the liquid cools to below the freezing temperature. The liquid to solid transition releases heat - when a mass $m$ of the liquid freezes the heat released is $Lm$ where $L$ is the latent heat of fusion. When solidification of the supercooled liquid starts this released heat pushes the temperature up again. Hence the dip and rise in the cooling curve.